body,html
  line-height:1
  font-weight:200
  font-family:'PingFang SC','STHeitiSC-Light','Helvetica-Light',Arial,sans-serif

.clearfix
  display:inline-block
  &:after
    display:block
    content:''
    height:0
    line-height:0
    clear:both
    visibility :hidden

@media (-webkit-min-device-pixel-ratio: 1.5),(min-device-pixel-ratio:1.5)
  .border-1px
    &:after
      -webkit-transform :scaleY(0.7)
      transform:scaleY(0.7)

@media (-webkit-min-device-pixel-ratio: 2),(min-device-pixel-ratio:2)
  .border-1px
    &:after
      -webkit-transform :scaleY(0.5)
      transform:scaleY(0.5)